Cyclonic separator



I. HEDlN July 16, 1968 CYCLONIC SEPARATOR Filed Nov. 22, 1966 FIGI.

INVENTORI INGEMAR HEDIN ATTYS.

United States Patent 3,392,513 CYCLONIC SEPARATOR Ingemar Hedin, Vaxjo,Sweden, assignor to Aktiebolaget Svenska Flakfabriken, Stockholm, SwedenFiled Nov. 22, 1966, Ser. No. 596,136 Claims priority, applicationSweden, Nov. 26, 1965, 15,295/ 65 3 Claims. (Cl. 55-425) ABSTRACT OF THEDISCLOSURE A cyclonic separator comprising a generally cylindricalcasing having a spiral inlet portion with a tangential inlet forintroducing dust-laden raw gas thereinto, and a central outlet tube forexhausting clean gas from the casing, the casing terminating at itsopposite end in a plane botton wall having dust outlets therein fordischarging the dust into a collecting bin of larger diameter than theopenings. The bottom wall serves as the top wall of the collecting binand provides a re-entrant releasing edgefor said dust outlets. Dampersclose the dust outlets when the dust-collecting bin is emptied orexchanged to permit continued operation of the separator.

The present invention relates to a cyclonic separator having a generallycylindrical casing shell provided above one end with an inlet portionhaving one or more tangential inlets for raw gas and enclosing a centraltube for outgoing clean gas. The shell of the casing terminates at theopposite end in a bottom edge, and an imperforate plane bottom wall ismounted coplanar with the edge and forms one or more openings betweenthe shell bottom edge and the outer periphery of the bottom wall toserve as outlets for separated dust.

The cyclonic separator according to the invention is preferably intendedfor use as a detached unit of vertical mounting.

In accordance with the present invention, the separator beyond thebottom wall is provided with a lower casing of generally cylindricalform having a cross-sectional area exceeding that of the shell at itsbottom edge, the upper wall of the lower casing being coplanar with thebottom edge of said wall, and extending outwardly beyond the shell toform a releasing edge for the dust outlet openings. Preferably, theshell has a converging frusto-conical portion between the inlet and thebottom edge, and the dust openings are provided with dampers which maybe displaced to cover the dust openings when the lower casing is emptiedor exchanged.

By providing the casing with a releasing edge, a high degree ofseparation of the dust from the main casing is obtained, and the closingof the dampers for the outlet openings permits emptying or exchanging ofthe collecting dust bin while the separator is in operation.

An embodiment of the cyclonic separator according to the invention willnow be described more in detail in the following with reference to theaccompanying drawing figures whereof FIG. 1 shows a section through acyclonic separator according to the invention,

FIG. 2 shows a view from above of the separator according to FIG. 1, and

FIG. 3 shows a horizontal view of a bottom plate.

With reference to the drawing, the separator comprises a generallycylindrical shell 3 having above its upper end a tangential inlet 1 fordust-laden raw gas, and above said inlet, an outlet head 5 for cleangas, and at the bottom, a lower casing 9 having a dust-collecting bin 10mounted thereon. At the upper end, the inlet portion 2 of the shell isof spiral form, as shown in FIG. 2, so that the dustladen gas enteringthrough the inlet 1 has a helical rotary motion imparted thereto. In itsrotating state, the gas is directed into a straight cylindrical portion3 of the shell having a lower frusto-conical portion in which the dustis centrifugally separated from the gas, the cleaned gas leaving theshell through a central tube 4 projecting through and beyond said inlet1 at the inlet end, the tube being connected to the outlet head 5. Atits lower end, the shell terminates in a, bottom edge, and has coplanartherewith a plane bottom wall 6, which in the present instance hascut-outs in its outer periphery which, in conjunction with the bottomedge, form two dust-outlet openings 7 positioned diametrically oppositeone another.

The lower casing 9 is of straight cylindrical form having an enlargedcross-sectional dimension relative to the cross-sectional dimension ofthe shell at its bottom edge. As shown in FIG. 1, the top Wall of thecasing 9 is coplanar with the wall 6 and extends beyond the shell toprovide a releasing edge 12 for the dust openings 7. In the operation ofthe separator, the dust flows out of the shell through the lower casingand is collected in the collecting-dust bin 10, which, by a liftingdevice attached to the lower casing 9 of the separator (not shown), canbe raised up to the separator into tight engagement with the groove 11in the lower casing. Dampers 8 are provided for the dust outlet openings7 which may be displaced as indicated by the arrows to cover theopenings 7, so that the collecting bin 10 may be emptied or exchangedwhile the separator is operating.

I claim:

1. In a cyclonic separator comprising a casing including a shell with agenerally cylindrical portion having an inlet end with at least onetangential inlet for raw gas, a tube projecting through and beyond saidtangential inlet centrally within said inlet portion to constitute aclean gas outlet, said shell having a bottom edge at the opposite end, aplane transverse bottom wall spaced from said outlet tube coplanar withsaid bottom edge, said plane wall being imperforate and extending tosaid bottom edge for a substantial portion of its periphery and formingwith said edge at least one dust opening therebetween at the outerperiphery of said wall to serve as an outlet for the separated dust; theimprovement wherein said separator includes a lower casing beyond saidbottom wall and of greater diameter than said shell at said bottom edge,said casing having a top wall coplanar with said bottom edge and saidimperforate wall and extending from said bottom edge outwardly beyondthe bottom edge of said shell, whereby the juncture of said top wall andsaid bottom edge forms a releasing edge for said dust opening.

2. A cyclonic separator according to claim 1 wherein said shell has atits lower end a downwardly converging frusto-conical portion terminatingin said bottom edge.

3. A cyclonic separator according to claim 1 wherein said bottom wallforms two diametrically-opposed dust openings with the bottom edge ofsaid shell at the outer periphery of said wall and including dampers insaid lower chamber mounted to cover said dust openings when said lowercasing is emptied or exchanged.

References Cited UNITED STATES PATENTS Kutsche 55426 Porbeck 55459Newman 55429 Jacobsen 55459 Verrell 55457 2,869,677 l/1959 Yellott eta1. 55459 3,056,662 10/1962 Ridgway.

FOREIGN PATENTS 759,118 10/1956 Great Britain. 900,696 7/1962 GreatBritain.

HARRY B. THORNTON, Primary Examiner.

B. NOZICK, Assistant Examiner.

